added support for S classes in replaceChild
fixed issue with replaceChild when the child existed within a list
improved the Display of extended trees now it can be flattened such that it is easy to compare to the base tree
added new tests. mainly for display of extended trees
added option for flattning of trees in display
renamed files that still had the initial destecs names + added the long missing ability to comment in the editor
updated version to 1.5.0